The Mini Factory 4.1 Full System Exhaust styling similar to 4.1 RCT big bike products, with an aggressive look and sound (only lacking the big bike model's internal resonance chamber module). The Factory 4.1 achieves a shorter overall length that is less susceptible to crash damage and complementary to the Factory Forward Engineering - moving the muffler(s) closer to the motor to centralize mass. Visible changes to the exterior include a redesigned canister to increase internal capacity for the maximum volume of packing material. The packing itself was not overlooked - a proprietary blend formulated for superior durability and sound attenuation. The final component is a new rear endcap engineered for simple tuning adjustments incorporating a snap ring feature to secure the standard and optional inserts. Massive POWER gains throughout the RPM range. Quieter than stock. Huge weight savings.